Roulette is a casino game that features a spinning wheel and a green felt table, with betting areas for numbers and groups of numbers. The croupiers stand in front of the table to accept bets. The wheel itself is a solid wooden disk, slightly convex in shape, with a metal plate around its edge. Thirty-six compartments are painted alternately red and black, with a single number numbered one to 36 (on European-style wheels), plus two green ones labelled 0 and 00 (on American-style wheels).
Bets can be placed on individual numbers or various groupings of numbers. They can also be made on the color of a number (red or black) or whether it is odd or even. Outside bets (those placed on small number combinations within the main grid, 1 to 36) offer higher payouts but lower chances of winning; they also lose if the wheel lands on 0.
The Reverse Martingale System is a popular strategy, aiming to recoup losses and win small profits by doubling stakes after every losing spin. However, this strategy can bankrupt players if they don’t manage their money carefully. The D’Alembert System is another classic that works by lowering stakes after each win.